takethebounce
Active VIP Member
If you don't already you must understand how the geometry of the sled works, which years had what suspesion changes and what exactly you want the changes to do.
Enzo racing specializes in bike suspension and dables in snowmobile suspension. The revlaving and rebuilding they do is very expensive and there are a few people, some on this forum as well that choose to go with Enzo for revalving. No amount of revalving will cure the Summits suspension issues.
Nothing they do to the rear suspension can replace what the S-36 does. It can't and won't. The S-36 package is a suspension/control package from Ski-doo. It is a narrow stance a-arm replacement that makes the ski stance 36" wide. 4" narrower than stock configuration on 2008-2010 sleds.
BRP does offer a 2010 rear suspension update that comes with rails, longer shock and the revalving for the rear shock that was already spoken of. Someone posted the part number above. Easier to just get a longer shock with relocating brackets and replace the rear shock with something else.
2008 Sleds had alot of reported sag issues. Improper valving/charging in the rear shocks lead to this.
2009 there was not as much issues with sag. Ski-doo builds their sled with a certain amount of sag. Look in your owners manual. The sag allows the skid to drop out of the tunnel in deep snow. Don't confused sag with bottoming out.
In 2010 ski-doo changed the shock length and mounting postion of the front skid shock. 1" longer. This allowed for better handling, but actually has negative effects on deep snow performance. Personally I don't notice it.
2011 was the first time the Summits came with the narrow stance front end (S-36). The narrow stance along with the 2010 rear shock changes greatly effected how the sled handled and for many people, more imprtantly how it "layed over".
A longer middle shock with relocation brackets will not cure sag. There are scissor relocation brackets that moves the rear scissor further back as well. This keeps the rear suspension pressure upwards. The rear scissor tends to collapse too much under load. The rear scissor brackets are good for any year summit.
On top of all that, the stock rear torsion springs are too light. These are what keep the tunnel out of the snow. BRP must have had a 12 year old girl ride the summit when making spring choices. Running the stock springs in the highest setting will not make enough difference. Better off getting the heavier springs. They likely need to be replaced anyways if they are over 2 years old.
hopefully that makes sense.
